To make this aspect stone, I used a succession of dry brushings and wash, on a first base posed with the airbrush. The secret is to let the brush at first, then accentuate the random effects. Do not hesitate to put all the colors. Here I spent turquoise, purple, black red, green and brown juices.

Once we have a result that satisfies us, the rest of the base (here sand) must be painted in a complementary, the orange in this case.